What type of muscle fibers are classified as slow twitch fibers?

Slow twitch muscle fibers are classified as Type 1 fibers. These fibers are characterized by their high endurance and ability to perform sustained activities over long periods, making them ideal for aerobic exercises. They have a rich supply of blood vessels and mitochondria, which enhance oxygen delivery and utilization, leading to efficient energy production through aerobic metabolism. This type of fiber contracts more slowly than fast twitch fibers, which allows for prolonged, low-intensity activities such as distance running, cycling, and swimming. The unique properties of Type 1 fibers, such as their fatigue resistance and efficient use of oxygen, are essential for athletes who need endurance over speed and power.